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52
AIR CONDITIONING
AIRFLOW
070 MODEL
090 MODEL
110, 135,
TONS (12,000 BTU/HR)
(CFM)
& 155 MODELS
1-1/2
525
X
X
2
700
X
X
X
2-1/2
875
X
X
X
3
1050
X
X
X
3-1/2
1225
X
X
X
4
1400
X
X
5
1750
X
6
2100
X
X-INDICATES AN ALLOWABLE SELECTION.
2
1
2
1
1
2
COOLING TONNAGE VS. AIRFLOW (CFM)
1. DEFAULT A/C AIRFLOW WHEN A/C SWITCHES ARE IN OFF POSITION
2. DEFAULT CONT. FAN AIRFLOW WHEN CF SWITCHES ARE IN OFF POSITION
3. SWITCH POSITIONS ARE ALSO SHOWN ON FURNACE WIRING DIAGRAM
525
2
700
700
875
2
1050
875
1050
1
1225
1225
1400
1225
1750
1
1225
2100
DEF.
DEF.
070
BASED ON 350 CFM/TON (SETUP SWITCH SW1-5 OFF, SW4-3 OFF)
SETUP SWITCH SW2 OR SW3 POSITIONS
MODEL
SIZE
525
2
700
875
1050
1225 1400
1
1400
DEF.
090
600
2
800
1000 1200
1
1400 1400 1400
DEF.
BASED ON 400 CFM/TON (SETUP SWITCH SW1-5 ON, SW4-3 OFF)
SETUP SWITCH SW2 OR SW3 POSITIONS
MODEL
SIZE
800
1000
2
1200 1400
1600 2000
1
2200
DEF.
600
2
800
1000 1200
1400 1600
1
1600
DEF.
488
2
651
651
814
2
976
814
976
1
1139
1139
1302
1139
1627
1
1139
1950
DEF.
DEF.
070
110, 135, 155
BASED ON 325 CFM/TON (SETUP SWITCH SW1-5 OFF, SW4-3 ON)
SETUP SWITCH SW2 OR SW3 POSITIONS
MODEL
SIZE
488
2
651
814
976
1139 1302
1
1302
DEF.
090
558
2
744
744
930
2
1116
930
1116
1
1302
1302
1488
1302
1860
1
1302
2200
DEF.
DEF.
070
110, 135, 155
BASED ON 370 CFM/TON (SETUP SWITCH SW1-5 ON, SW4-3 ON)
SETUP SWITCH SW2 OR SW3 POSITIONS
MODEL
SIZE
558
2
744
930
1116
1302 1488
1
1488
DEF.
090
070
090
110, 135, 155
110, 135, 155
A13055
Fig. 57 -- Cooling (A/C) or Continuous--Fan (CF) Airflow Selection Chart
d.
Flame--Proving
-- When the burner flame is proved at
the flame--proving sensor electrode FSE, the inducer
motor IDM switches to low--speed unless the furnace
is operating in high--heat, and the furnace control CPU
begins the blower--ON delay period and continues to
hold the gas valve GV--M open. If the burner flame is
not proved within two seconds, the control CPU will
close the gas valve GV--M, and the control CPU will
repeat the ignition sequence for up to three more Tri-
als--For--Ignition before going to Ignition--Lockout.
Lockout will be reset automatically after three hours,
or by momentarily interrupting 115 vac power to the
furnace, or by interrupting 24 vac power at SEC1 or
SEC2 to the furnace control CPU (not at W/W1, G, R,
58C
V